"Flying squirrels have many vocalizations, some audible to humans, some not. They use high-pitched sounds for navigation, similar to the echolocation system of bats. Loud things come in small packages!" http://soundboard.com/sb/jerboa_sounds_music.aspx

"A lot of people spend time talking to the Animals, but not that many people listen. That's the real problem! ... Winnie the Pooh